First observation of feshbach resonances at very low magnetic field in a 133Cs fountain. - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2006

First observation of feshbach resonances at very low magnetic field in a 133Cs fountain.

Résumé

One of the main limitations of cesium atomic fountains has been the cold collision frequency shift. By using a method based on a transfer of population by adiabatic passage allowing to prepare cold atomic samples with a well defined ratio of atomic density as well as atom number the collisional shift is controlled at the 10E-3 of its value. A calibration of Zeeman sub-states contribution to the clock shift as a function of the field has been performed. Feshbach resonances have been observed for the first time at very low magnetic field and with a very good resolution. A Monte Carlo simulation has been performed and could fit properly some of experimental data. This constrains some parameters of the theory of collisions.
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Dates et versions

hal-00002196 , version 1 (12-07-2004)
hal-00002196 , version 2 (16-07-2004)
hal-00002196 , version 3 (05-08-2006)

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H. Marion, S. Bize, L. Cacciapuoti, D. Chambon, F. Pereira Dos Santos, et al.. First observation of feshbach resonances at very low magnetic field in a 133Cs fountain.. 2006. ⟨hal-00002196v3⟩
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